Black cold drawn seamless square steel pipe Introduction
Black cold drawn seamless square steel pipe is made of strip steel after process processing. To change the square pipe: generally, the strip is unpacked, flat, crimped, welded into a round tube, and then rolled into a square tube and then cut to the required length.When the square steel tube is cold drawn, the plastic deformation occurs through a certain shape and size mold. At present, the production method of drawing can be roughly divided into three kinds: reducing tube drawing, subtract the outer wall tube drawing and reduction of wall tube drawing, cold drawing。
Black cold drawn seamless square steel pipe technical parameters and details
Material | Size |
Q345B | 84*84*5.6 |
Q345B | 70*70*8.9 |
Q345B | 73*73*4.9 |
Q345B | 19*19*0.8 |
Q345B | 89*89*4.6 |
Q345B | 24*24*2.1 |
Production process
Raw material – annealing for material of 45#, 27SiMn, 25Mn – Acid cleaning – parkerizing & Saponifying – cold drawn – leveling – saw off bad section – stress relieving – leveling – inspection – oiled plated - packing
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